JP2019041360A - Image reading device and image forming apparatus - Google Patents

Abstract

To provide an image reading device that can prevent electrostatic breakdown of an image sensor at a low cost.SOLUTION: In an image reading device 2, a contact part 22 has translucency. A sensor unit 25 includes a light source 255 and an image sensor 253 that are arranged separated from first surfaces of the contact part 22, and optically reads a document on second surfaces of the contact part 22. A contact part 257 is provided on the sensor unit 25 and has first ends G1 to G4 that are in contact with the first surfaces A1, B1. The first ends G1 to G4 have conductivity and are grounded.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an image reading apparatus that optically reads an original image on a contact portion and generates image data representing the original image, and an image forming apparatus including the image reading apparatus.

  As a reading method of the image reading apparatus, there is an equal magnification optical system type.

  In the same-magnification optical system type, for example, the light emitted from the light emitting diode is irradiated onto the document image on the contact portion via the light guide. The reflected light in the original image is focused on a complementary metal oxide semiconductor (CMOS) image sensor via a rod lens array.

  In the image reading apparatus, a plurality of documents may be continuously conveyed on the ADF contact portion by an ADF (Automatic Document Feeder) or the like. Further, the document table cover of the document table contact portion may be repeatedly opened and closed for document setting. As a result, static electricity is generated on the front and back surfaces of the contact portion.

  In the 1 × optical system type, the CMOS image sensor is close to the contact portion. Therefore, dielectric breakdown is likely to occur between the back surface of the contact portion and the CMOS image sensor. The CMOS image sensor may be electrostatically broken due to the dielectric breakdown.

  Therefore, conventionally, a measure has been taken in which a conductive film is brought into contact with the contact portion and the conductive film is grounded (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 10-112771

  However, if components such as the conductive film are added only for the countermeasure against static electricity, the manufacturing cost of the image reading apparatus increases.

  An object of the present invention is to provide an image reading apparatus and an image forming apparatus that can suppress electrostatic breakdown of an image sensor at low cost.

  An image reading apparatus according to one aspect of the present invention includes a contact portion, a sensor unit, and a contact portion. The contact portion has translucency. The sensor unit includes a light source and an image sensor arranged apart from the first surface of the contact portion, and optically reads a document on the second surface of the contact portion to generate image data. The contact portion is provided in the sensor unit and has a first end portion that contacts the first surface, and the first end portion is electrically conductive and grounded.

  An image forming apparatus according to another aspect of the present invention includes the image reading device and an image forming unit. The image forming unit forms an image based on the image data generated by the sensor unit.

  According to the present invention, it is possible to provide an image reading apparatus and an image forming apparatus that can suppress electrostatic breakdown of an image sensor at low cost.

FIG. 1 is a schematic diagram illustrating a configuration of an image reading apparatus and an image forming apparatus including the image reading apparatus according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing a detailed configuration of the image reading apparatus shown in FIG. FIG. 3 is a schematic diagram showing a detailed configuration of the image reading apparatus from which the document table cover shown in FIG. 2 is removed. 4 is a cross-sectional view of the sensor unit shown in FIGS. 2 and 3 cut along a virtual plane parallel to the left-right direction. FIG. 5 is a schematic diagram showing a planar shape when the sensor unit shown in FIGS. 1 to 3 is viewed from the left-right direction.

  Hereinafter, each embodiment of the present invention will be described with reference to the accompanying drawings for understanding of the present invention. The following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention.

  1 to 5, the X axis, the Y axis, and the Z axis are orthogonal to each other and indicate the left-right direction, the front-rear direction, and the up-down direction of the image forming apparatus 1 and the image reading apparatus 2.

[Embodiment]
In FIG. 1, an image forming apparatus 1 is, for example, a copying machine, a printer, a facsimile machine, or a multifunction machine. The multifunction device has a plurality of functions such as a copy function, a print function, and a fax function.

  The image forming apparatus 1 includes an image reading device 2 and a main body device 3.

  The image reading device 2 is provided on the upper portion of the main body device 3. Note that the image reading apparatus 2 may be a scanner or the like independent of the image forming apparatus 1.

  As shown in FIGS. 2 and 3, the image reading apparatus 2 includes a housing 21, a contact unit 22, an ADF (Automatic Document Feeder) 23, a document table cover 24, a sensor unit 25, a carriage 26, and a plurality of urging units 27. And a feed mechanism 28 and the like.

  Further, the image reading apparatus 2 includes a control unit (not shown) including a CPU, a ROM, a RAM, and the like. The CPU executes a program stored in advance in the ROM while using the RAM as a work area. Thereby, the CPU controls the image forming apparatus 1 in an integrated manner, and executes various processes such as an image reading process or an image forming process.

  The control unit may be provided in the main body device 3. The control unit may be an electronic circuit such as an application specific integrated circuit (ASIC) or a digital signal processor (DSP).

  The casing 21 houses a sensor unit 25, a carriage 26, an urging unit 27, a feed mechanism 28, and the like.

  The contact part 22 includes a first contact part 221 and a second contact part 222.

  Each of the first contact portion 221 and the second contact portion 222 is a flat plate made of light-transmitting glass or resin. The first contact portion 221 and the second contact portion 222 are attached to the upper surface of the housing 21 in a state where they are electrically insulated from each other. Specifically, the first contact part 221 is attached to the left end side of the housing 21, and the second contact part 222 is attached to a position away from the first contact part 221 in the right direction.

  The first contact portion 221 has a first surface A1 and a second surface A2. The second surface A2 faces the first surface A1 in parallel in the upward direction.

  Each of the first surface A1 and the second surface A2 is a rectangular surface extending in the front-rear direction.

  The original document conveyed by the ADF 13 passes on the second surface A2. A reading position A3 parallel to the front-rear direction is predetermined on the second surface A2. The reading position A3 is an example of a reading area that is an area where the sensor unit 25 can read the original.

  Linear light (details will be described later) emitted from the sensor unit 25 is incident on the first surface A1 from below. The linear light passes through the first contact portion 221 and is emitted from the reading position A3.

  Further, the second contact portion 222 has a first surface B1 and a second surface B2.

  Each of the first surface B1 and the second surface B2 is a rectangular surface having sides parallel to the front-rear direction and two sides parallel to the left-right direction. The second surface B2 faces the first surface B1 in parallel in the upward direction.

  The document is placed on the second surface B2.

  On the second surface B2, a reading start position B3 and a reading end position B4 parallel to the front-rear direction are determined in advance. The reading start position B3 is a position near the left end side of the second surface B2. The reading end position B4 is a position that is separated by a predetermined distance in the right direction with respect to the reading start position B3. The predetermined distance matches, for example, the maximum length of the long side of the original that can be read by the image reading apparatus 2. In the configuration in which the horizontal width of the document placed on the second contact portion 222 can be detected in advance, the predetermined distance may be changed according to the detected width.

  An area from the reading start position B3 to the reading end position B4 in the left-right direction is determined in advance as a rectangular area B5 which is another example of the reading area.

  Linear light from the sensor unit 25 enters the first surface B1 from below. The linear light passes through the second contact portion 222 and is emitted from the second surface B2. Since the sensor unit 25 is conveyed in the left-right direction, the linear light is sequentially emitted from the rectangular area B5.

  The ADF 23 is a document conveying device, and is attached to the upper surface of the housing 21. The ADF 23 includes a document setting unit 231, a document guide 232, a plurality of roller pairs 233, and a document discharge unit 234.

  The document setting unit 231 is a document tray or the like. A plurality of the originals can be placed on the original setting unit 231.

  The document guide 232 is a plate-like member extending in the front-rear direction. The document guide 232 is provided above the reading position A3 with a predetermined interval with respect to the reading position A3.

  The plurality of roller pairs 233 are rotated by a driving force transmitted from a motor (not shown) under the control of the control unit. The plurality of roller pairs 233 convey the originals placed on the original setting unit 231 one by one between the original guide 232 and the reading position A3 to the original discharge unit 234.

  As a result, the ADF 23 conveys the document set on the document setting unit 231 onto the reading position A3 on the second surface A2 of the first contact unit 221.

  The document discharge unit 234 is a discharge tray or the like. The document that has passed through the reading position A3 is discharged to the document discharge unit 234.

  The document table cover 24 can be opened and closed by a user operation, and covers the first contact portion 221 and the second contact portion 222 from above.

  The sensor unit 25 is a CIS (Contact Image Sensor) of the same magnification optical system type, and is a device that optically reads the document on the second surface A2 or the second surface B2 and generates image data.

  The sensor unit 25 may be a reduction optical system type.

  The sensor unit 25 is movable in the left-right direction immediately below the first contact portion 221 and the second contact portion 222.

  The carriage 26 is made of a resin material or the like. The carriage 26 extends in the front-rear direction. The carriage 26 slides on the guide rail 111 in the left-right direction while being supported by the guide rail 111 extending in the left-right direction on the bottom surface of the housing 11.

  A sensor unit 25 is mounted on the upper surface of the carriage 26 via a plurality of urging portions 27.

  The urging unit 27 is a coil spring or the like, and applies an upward force F <b> 1 to the bottom surface of the sensor unit 25. Thereby, the sensor unit 25 is pressed against the first surfaces A1 and B1.

  The feed mechanism 28 includes a combination of a motor and a ball screw, or a combination of a motor and an endless belt. The feed mechanism 28 transports the sensor unit 25 in the left-right direction under the control of the control unit.

  Specifically, when image data is generated by the sensor unit 25 from the document conveyed by the ADF 23, the feeding mechanism 28 sends the sensor unit 25 to the first surface A1 side of the first contact portion 221 and stops it. . More specifically, the sensor unit 25 is stopped at a position where an optical axis surface E1 described later is directly below the reading position A3. Specifically, the control unit controls the feeding mechanism 28 to control the sensor unit 25 when the document is set on the document setting unit 231 and the sensor unit 25 is moved to the first contact unit. The image of the original is read by moving to the 221 side.

  After the stop, the sensor unit 25 optically reads the document passing over the reading position A3 conveyed by the ADF 23, and generates image data.

  On the other hand, when image data is generated by the sensor unit 25 from the document placed on the second surface B2 of the second contact portion 222, the feeding mechanism 28 is located on the first surface B1 side of the second contact portion 222. The sensor unit 25 is moved in the left-right direction. Specifically, the control unit controls the feeding mechanism 28 to make the second contact of the sensor unit 25 when an image reading process start operation is performed in a state where no document is set on the document setting unit 231. The image of the original is read by moving to the unit 222 side.

  More specifically, the sensor unit 25 temporarily stops at a position where an optical axis surface E1 described later is directly below the reading start position B3. Thereafter, the sensor unit 25 is moved in the left-right direction toward the reading end position B4.

  While moving in the left-right direction, the sensor unit 25 reads the document placed in the rectangular area B5 and generates image data.

  The sensor unit 25 may be fixedly disposed not only inside the housing 11 but also inside the ADF 23. Specifically, the sensor unit 25 is fixedly disposed at a location on the document transport path in the ADF 23 other than directly below the reading position A3. In this case, the sensor unit 25 reads the original document conveyed on the conveyance path at the arrangement position in the ADF 23.

  Refer to FIG. 1 again. The main body device 3 includes an image forming unit 31, a paper feed cassette 32, and the like.

  The image forming unit 31 forms an image represented by the image data on a sheet supplied from the paper feed cassette 32. Specifically, the image forming unit 31 includes an electrophotographic unit (not shown) including a laser scanning unit (LSU), a photosensitive drum 311, a charger 312, a developing unit 313, a transfer unit 314, a fixing roller 315, a pressure roller 316, and the like. This is an image forming unit of the type. The image forming unit 31 may form a monochrome image, but may form a color image by, for example, a tandem method. The image forming unit 31 may be, for example, an inkjet image forming unit.

  Next, a detailed configuration example of the sensor unit 25 will be described.

  4 and 5, the sensor unit 25 includes a housing 251, a circuit board 252, an image sensor 253, a light guide unit 254, a light source 255, a lens array 256, and a contact unit 257.

  The housing 251 is made of resin or the like. The internal space C1 of the housing 251 has a rectangular shape extending in the front-rear direction in a plan view from the upper direction.

  In the internal space C1, the image sensor 253, the light guide unit 254, the light source 255, the lens array 256, and the contact unit 257 are accommodated.

  The circuit board 252 is fixedly disposed at a position near the lower end in the internal space C1.

  The circuit board 252 has a third surface D1 and a fourth surface D2. Each of the third surface D1 and the fourth surface D2 is a rectangular surface extending in the front-rear direction. The third surface D1 and the fourth surface D2 face each other in parallel in the vertical direction. The fourth surface D2 is a surface closer to the second surface A2 and the second surface B2 than the third surface D1.

  A ground electrode D3 is formed on the fourth surface D2. The ground electrode D3 is provided at the four corners of the rectangular fourth surface C2 in plan view from above.

  The ground electrode D3 may be independently formed at the four corners. In addition, one linear ground electrode D3 may be formed so as to pass through the four corners.

  The ground electrode D3 is electrically connected to a reference potential point provided on the housing 21 or the like.

  In addition, peripheral circuits and the like of the image sensor 253 are formed on the fourth surface D2.

  The image sensor 253 is a CMOS line sensor, for example, and includes a plurality of imaging elements arranged in a line. Hereinafter, a surface including each optical axis of the plurality of imaging elements is referred to as an optical axis plane E1.

  The image sensor 253 is disposed away from the first surfaces A1 and B1. The image sensor 253 is mounted on the fourth surface D2 so that the optical axis surface E1 is parallel to the front-rear direction.

  The image sensor 253 has various terminals including a ground terminal T1. The ground terminal T1 is electrically connected to the ground electrode D3.

  The light guide unit 254 includes two light guides 2541 and 2542. The light guides 2541 and 2542 are provided above the circuit board 252 in the internal space C1, and extend along the front-rear direction. The light guides 2541 and 2542 are symmetrical with respect to the optical axis plane E1.

  The light source 255 includes two light emitting elements 2551, 2552. Note that the number of light guides and light emitting elements included in each of the light guide unit 254 and the light source 255 is not limited thereto.

  The light emitting elements 2551, 2552 are, for example, light emitting diodes. The light emitting elements 2551, 2552 are arranged away from the first surfaces A1, B1. The light emitting elements 2551, 2552 are respectively attached to the end faces of the light guides 2541, 2542 in the front-rear direction.

  Light emitted from the light emitting elements 2551, 2552 is incident on the end surfaces of the light guides 2541, 2542, respectively. Incident light propagates in the front-rear direction while repeating total reflection inside the light guides 2541, 2542.

  In addition, a plurality of reflecting portions are formed at the lower ends of the light guides 2541 and 2542. The reflection part is a prism or a reflection sheet. Incident light to the plurality of reflecting portions is reflected and emitted from the upper ends of the light guides 2541 and 2542 as linear light extending in the front-rear direction.

  The linear light emitted from the light guides 2541 and 2542 is transmitted through the first contact portion 221 or the second contact portion 222 and reflected by the original on the first contact portion 221 or the second contact portion 222. The

  The lens array 256 is, for example, a green lens array. The lens array 256 extends in the front-rear direction and is disposed on the optical axis plane E1. Further, the lower end surface of the lens array 256 may be separated from each image sensor of the image sensor 253 or may be in contact with the image sensor.

  Reflected light from the document enters from the upper end surface of the lens array 256. Incident light is emitted from the lower end surface while being refracted inside the lens array 256 due to the refractive index distribution inside the lens array 256, and is imaged by the image sensor 253.

  In the image sensor 253, the plurality of imaging elements sequentially output an electrical signal indicating the amount of incident light on itself. Thereby, image data for one line in the front-rear direction is generated.

  The light guide unit 254 may include one light guide, and the light source 255 may include one light emitting element. The light guide 254 and the light source 255 may be replaced with a fluorescent lamp extending in the front-rear direction.

  Further, in order to prevent stray light from entering the image sensor 253, a light shielding unit made of an opaque resin or the like is provided between the light source 255 and the image sensor 253 in the internal space C1.

  In order for the light emitted from the lens array 256 to be accurately imaged on the image sensor 253, the positions of the light source 255, the image sensor 253, and the like in the up and down direction are on the first surfaces A1 and B1 regardless of the conveyance of the sensor unit 25. On the other hand, it needs to be kept constant.

  A contact portion 257 is provided to keep the position constant. The contact portion 257 includes four contact members 2571 to 2574.

  The contact members 2571 to 2574 are made of resin or the like. The contact members 2571 to 2574 protrude upward from the upper end surface of the housing 251 as a reference.

  The contact members 2571 and 2572 are provided at positions sandwiching the optical axis plane E1 in a plan view from the left and right direction. The contact members 2573 and 2574 are provided at positions separated in the left-right direction with respect to the contact members 2571 and 2572.

  The number of contact members may be other than four. The abutting portion 257 may include two or three abutting members provided at positions sandwiching the optical axis surface E1 in a plan view from the left-right direction. In addition, the contact portion 257 may be provided away from the optical axis plane E1 in a plan view from the left-right direction.

  The upper ends of the contact members 2571 to 2574 are the first ends G1 to G4. The contact members 2571 to 2574 are provided outside the reading area.

  The first end portions G1 to G4 have the same height in the vertical direction with respect to the fourth surface D2. Further, the first end portions G1 to G4 have, for example, an arc shape in a plan view from the left-right direction.

  With the above configuration, the first end portions G1 to G4 have the force F1 that the urging portion 27 applies to the housing 251 while maintaining the positions of the light source 255 and the image sensor 253 with respect to the second surfaces A2 and B2 during the image reading. Thus, when the original on the first surface A1 is read, the first contact portion 221 contacts the first surface A1 at the position on the first surface A1 side, and when the original on the first surface B1 is read, The second contact portion 222 contacts the first surface B1 at a position on the first surface B1 side. In particular, when the original on the first surface B1 is read, the first end portions G1 to G4 slide directly under the second surface B2 while being in contact with the second surface B2.

  During the image reading, the plurality of documents may be continuously conveyed on the first surface A1. Further, the document table cover 24 may be repeatedly opened and closed to set the document on the second contact portion 222. As a result, static electricity is generated in the first contact portion 221 and the second contact portion 222.

  In particular, in the same magnification optical system type, the position of the image sensor 253 is close to the first contact portion 221 and the second contact portion 222. Therefore, dielectric breakdown is likely to occur between the second surface A2 and the second surface B2 and the image sensor 253. The image sensor 253 may be electrostatically broken due to the dielectric breakdown.

  In order to prevent the electrostatic breakdown, conventionally, a measure may be taken in which a conductive film is brought into contact with a contact portion and the conductive film is grounded.

  However, if parts such as the conductive film are added only for the countermeasure against static electricity, the manufacturing cost of the image reading apparatus 2 increases.

  Therefore, the first ends G1 to G4 have conductivity and are grounded.

  Specifically, the contact members 2571 to 2574 are made of a conductive resin.

  The lower end portions of the contact members 2571 to 2574 are the second end portions H1 to H4. The second end portions H1 to H4 are provided on the ground electrode D3 provided at the four corners of the fourth surface C2, and are in contact with the ground electrode D3.

  Since the upward force F1 is applied to the casing 251 by the urging portion 27, the first ends G1 to G4 are not pressed against the first surfaces A1 and B1, but the ground electrode D3 is Pressed against the second ends H1 to H4.

  The contact members 2571 to 2574 are columnar bodies including the first end portions G1 to G4 and the second end portions H1 to H4, and are provided in the internal space C1.

  Note that the abutting members 2571 to 2574 are not limited to the interior space C1, and may penetrate the housing 251 in the vertical direction. In addition, the contact members 2571 to 2574 may be provided along the outer peripheral surface of the housing 251.

  Here, the casing 251 is smaller than the first contact member 221 with respect to the length in the left-right direction. The contact members 2571 to 2574 are provided near the optical axis plane E1 with respect to the positions in the left-right direction with reference to the first contact portion 221 and the second contact portion 222. In addition, since the contact members 2571 to 2574 protrude upward from the housing 251, the contact members 2571 to 2574 can be brought closer to the optical axis plane E1 in a plan view from the vertical direction as compared with conventional measures.

  In the conventional measure, that is, a measure in which the conductive film is brought into contact with the contact portion and the conductive film is grounded, the conductive film is disposed on the outer edge of the contact portion.

  The contact members 2571 to 2574 are entirely made of a conductive resin, and thus have conductivity between the first end portions G1 to G4 and the second end portions H1 to H4. Thereby, the first ends G1 to G4 are electrically connected to the ground electrode D3. However, the present invention is not limited to this, and when only the first end portions G1 to G4 have conductivity, the first end portions G1 to G4 may be electrically connected to the ground electrode D3 by a conductive wire or a conductor pattern. .

  The first end portions G1 to G4 may be metal films formed on the upper end portions of the contact members 2571 to 2574.

  With the above configuration, the first end portions G1 to G4 abut on the second surface A2 or the second surface B2 when the image is read. Accordingly, static electricity generated in the first contact portion 221 or the second contact portion 222 moves from the first end portions G1 to G4 to the ground electrode D3 of the circuit board 252 via the second end portions H1 to H4, respectively. .

  Thereby, since the charge amount of the 1st contact part 221 and the 2nd contact part 222 can be reduced, the electrostatic breakdown of the image sensor 253 can be suppressed.

  More specifically, the image sensor 253 is disposed almost immediately below the reading position A3 of the first contact portion 221 when generating image data from the original document conveyed by the ADF 23. In the first contact part 221, particularly, the periphery of the reading position A3 is charged by the sheet conveyed by the ADF 23.

  However, since the plurality of contact members 2571 to 2574 are close to the optical axis plane E1 in a plan view from the up and down direction, they contact the first contact portion 221 in the vicinity of the reading position A3. Accordingly, the charged potential can be kept low at the irradiation position of the linear light in the first contact portion 221 and in the vicinity thereof, and static electricity is hardly generated. As a result, electrostatic breakdown of the image sensor 253 can be suppressed more than the conventional countermeasures.

  When the image sensor 253 generates image data from the document placed on the second contact unit 222, the image sensor 253 is conveyed in the left-right direction directly below the second contact unit 222. Also in this case, since the plurality of contact members 2571 to 2574 are close to the optical axis plane E1, the charged potential can be kept low at and near the irradiation position of the linear light in the second contact portion 222. Become.

  Therefore, the method of grounding the contact members 2571 to 2574 having conductivity as in the image reading apparatus 2 has an effect that the electrostatic breakdown of the image sensor 253 can be suppressed as compared with the conventional measures.

  In addition, by taking countermeasures against static electricity only on the contact members 2571 to 2574, it is not necessary to add components such as the conductive film to the first contact portion 221 and the second contact portion 222, respectively. The manufacturing cost of 2 can be suppressed.

  When the image reading process is not executed, the sensor unit 25 stands by at a predetermined initial position in the left-right direction.

  During standby of the sensor unit 25, at least one of the contact members 2571 to 2574 may be in contact with the first contact portion 221, and at least one of the other contact members may be in contact with the second contact portion 222.

  As a result, even if the document table cover 24 is opened and closed before the image reading process, the charged potentials of the first contact portion 221 and the second contact portion 222 can be kept low.

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 2 Image reader 22 Contact part 221 1st contact part 222 2nd contact part A1, B1 1st surface A2, B2 2nd surface 25 Sensor unit 253 Image sensor 255 Light source 257 Contact part G1-G4 1st End H1 to H4 Second end 252 Circuit board C1 Inner space D1 Third surface D2 Fourth surface D3 Ground electrode 23 ADF (original transport device)
231 Document setting unit 28 Feed mechanism 3 Main unit 31 Image forming unit

Claims (6)

A translucent contact portion;
A sensor unit including a light source and an image sensor arranged apart from the first surface of the contact part, and optically reading a document on the second surface of the contact part to generate image data;
A first end portion that is provided in the sensor unit and contacts the first surface; the first end portion is electrically conductive and is grounded; and
An image reading apparatus comprising: The sensor unit includes a substrate on which a ground electrode electrically connected to the first end is formed.
The image reading apparatus according to claim 1. The substrate has a third surface and a fourth surface closer to the first surface than the third surface;
The ground electrode is formed on the fourth surface;
The contact portion has a second end portion that comes into contact with the ground electrode, and has conductivity between the first end portion and the second end portion.
The image reading apparatus according to claim 2. The contact portion includes a first contact portion and a second contact portion that are electrically insulated,
The image reading device includes:
An original conveying device for conveying an original set on the original setting portion onto the second surface of the first contact portion;
When image data is generated from the document conveyed by the document conveying device, the sensor unit is sent to the first surface side of the first contact portion to stop it, and the second surface of the second contact portion is A feed mechanism that moves the sensor unit on the first surface side of the second contact portion when image data is generated from the document placed on
With
The first end portion contacts the first surface at a position on the first surface side of the first contact portion, and contacts the first surface at a position on the first surface side of the second contact portion. ,
The image reading apparatus according to claim 1. In the contact portion, a reading area that is an area in which the sensor unit can read the original is defined,
The first end is provided outside the reading area,
The image reading apparatus according to claim 1. An image reading apparatus according to any one of claims 1 to 4,
An image forming unit that forms an image based on the image data generated by the sensor unit;
An image forming apparatus comprising:

Images